I am facing problem in adding noise in transient analysis in cadence spectre .
Can help me how to add noise as input source for transient analysis using simulator cadence spectre .
In reply to Andrew Beckett:
In reply to Analog Design:
I wan to do transient analysis by noise
signal in cadence spectre(version 5.4). Means I wan to give noise
signal as vsource .Then ,how would it can be made a noise source which
act as vsource(or vpulse type) for transient simulation . Or is there
any other approach to do this noise analysis in transient analysis .
Can any1 help me ?
First of all, please write full English words. You are not paying by the character here, so there is no need to abbreviate proper English words to "u" or "ur" or "any1". My natural inclination is to ignore any post written using such "text speak" because it is so difficult to comprehend - and even more so if English is not your first language (which is fair enough) and so I have to compensate for that too.
I merged all the different posts together on this. Asking the same question again (with no more information than the first time) is unlikely to increase your chances of getting an answer quickly. Given that everyone here is answering these forum questions as a community activity, the more detail and precision you can give, the better.
I already explained how to do this, so I am at a loss to know what the problem is. You did not say what you'd tried and what exactly did not work.
It's as simple as this:
That's it. Not hard. If this doesn't work, please explain precisely (using real words) what you were doing, what happened, what version of the IC environment and what version of spectre you were using, and any error messages that were given.
First of all, the Forum Guidelines say that you should not append new questions onto an existing, old post.
You can do what you want using Verilog-A. This has functions to generate white and flicker noise with coefficients, which should allow you to get the kind of shaping you want.
how to create a noiseless resistor instance in spectre ac noise analysis?
In reply to Songshu:
Putting aside the fact that you didn't read the previous entry in the post telling the previous appender not to append an old thread (especially when your question is not about noise files nor is it about transient analysis), as covered in the forum guidelines, you can do this by using the "isnoisy" parameter on a resistor (in analogLib this shows up as "Generate Noise" or something like that).
Alternatively there is (in recent IC versions in conjunction with recent MMSIM versions) a field on the Simulation->Options->Analog form which allows you to specify which devices do or don't include noise.
In reply to HamidKhatibi:
Which version of the IC tools and MMSIM tools are you using? Type "virtuoso -W" and "spectre -W" in the UNIX terminal window to find out...
It would be at the bottom of the Main tab on the Simulation Options Analog form, as shown in the picture.
Thank you for your answer. I do not have this option!
Is there any other way to do that?
You're using too old a version of spectre. You're using a bang up to date version of the IC tools, but are 3 major releases back on the simulator... there have been MMSIM10.1, MMSIM11.1 and MMSIM12.1 in the meantime. I suggest you move to the latest MMSIM12.1 hotfix.
With this, you can do what you want.
Thank you very much Andrew.
I should talk with my advisor :-)
Meanwhile, is there any other way to turn off some device's noise?
Not really. Some models and devices have the ability to turn off noise - e.g. resistors have an isnoisy parameter. In general you'd need this enhancement.
It does seem odd to use a very up to date IC version and a (at least) 3 year old simulator release. Normally people stay more up to date with the simulator than the IC release!
I see. I will definitely try to update it then :-)
Thank you very much,